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Biomolecules · Question 36

AIPMT 2008MCQEasy📈 Topic in 25% papers+4−1
1

In DNA, the complementary bases are

  1. adenine and guanine; thymine and cytosine
  2. uracil and adenine; cytosine and guanine
  3. adenine and thymine; guanine and cytosine
  4. adenine and thymine; guanine and uracil.

Answer

(3) adenine and thymine; guanine and cytosine

Solution

As per NCERT, the two strands of DNA are complementary: the bases pair by hydrogen bonds in a fixed way.

Adenine pairs with thymine (two hydrogen bonds).

Guanine pairs with cytosine (three hydrogen bonds).

Uracil is present in RNA, not in DNA.

The complementary bases are adenine and thymine; guanine and cytosine.

Answer: (3)

AIPMT 2008

Keep practising — Biomolecules

2

Which of the following is an amine hormone?

  1. Insulin
  2. Progesterone
  3. Thyroxine
  4. Oxypurine
AIPMT 2008
3

RNA and DNA are chiral molecules, their chirality is due to

  1. chiral bases
  2. chiral phosphate ester units
  3. D-sugar component
  4. L-sugar component
AIPMT 2007
4

Which of the following vitamins is water-soluble?

  1. Vitamin E
  2. Vitamin K
  3. Vitamin A
  4. Vitamin B
AIPMT 2007
5

The human body does not produce

  1. enzymes
  2. DNA
  3. vitamins
  4. hormones
AIPMT 2006
6

Which one of the following is a peptide hormone?

  1. Adrenaline
  2. Glucagon
  3. Testosterone
  4. Thyroxine
AIPMT 2006
7

During the process of digestion, the proteins present in food materials are hydrolysed to amino acids. The two enzymes involved in the process Proteins enzyme (A) Polypeptide enzyme (B) Amino acids are respectively

  1. invertase and zymase
  2. amylase and maltase
  3. diastase and lipase
  4. pepsin and trypsin
AIPMT 2006
8

Which functional group participates in disulphide bond formation in proteins?

  1. Thioester
  2. Thioether
  3. Thiol
  4. Thiolactone
AIPMT 2005
9

The cell membranes are mainly composed of

  1. fats
  2. proteins
  3. phospholipids
  4. carbohydrates
AIPMT 2005
10

A sequence of how many nucleotides in messenger RNA makes a codon for an amino acid?

  1. Three
  2. Four
  3. One
  4. Two
AIPMT 2004
11

The hormone that helps in the conversion of glucose to glycogen is

  1. cortisone
  2. bile acids
  3. adrenaline
  4. insulin
AIPMT 2004

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